US20200224716A1 - Bearing device for wheel - Google Patents
Bearing device for wheel Download PDFInfo
- Publication number
- US20200224716A1 US20200224716A1 US16/627,233 US201816627233A US2020224716A1 US 20200224716 A1 US20200224716 A1 US 20200224716A1 US 201816627233 A US201816627233 A US 201816627233A US 2020224716 A1 US2020224716 A1 US 2020224716A1
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- US
- United States
- Prior art keywords
- slinger
- bearing device
- outer ring
- cover portion
- inner shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/08—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with two or more rows of balls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
- F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
- F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B27/00—Hubs
- B60B27/0073—Hubs characterised by sealing means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
- F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
- F16C19/182—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact in tandem arrangement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
- F16C33/585—Details of specific parts of races of raceways, e.g. ribs to guide the rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
- F16C33/7806—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for spherical roller bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
- F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
- F16C33/7876—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section with sealing lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
- F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
- F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
- F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
- F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
- F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
- F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
- F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/30—Coating surfaces
- F16C2223/42—Coating surfaces by spraying the coating material, e.g. plasma spraying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/02—Wheel hubs or castors
Definitions
- aspects of the present invention relate to a bearing device for a wheel, and more particularly to improvement of a sealing device.
- a bearing device of Patent Document 1 includes an outer ring 81 fixed to a suspension device such as a knuckle and an inner shaft 82 which is rotatable inside the outer ring 81 .
- a leg portion 86 for fixing the bearing device to the knuckle is provided on the outer periphery of the outer ring 81 and a flange 85 for fixing the wheel is provided at the shaft end of the inner shaft 82 .
- a plurality of balls 87 are incorporated between the outer ring 81 and the inner shaft 82 .
- Grease is sealed in an annular space K formed between the inner periphery of the outer ring 81 and the outer periphery of the inner shaft 82 and the raceway surface on which the ball 87 rolls is lubricated.
- Sealing devices are respectively incorporated in opening portions on both sides in an axial direction of the annular space K to prevent foreign matters such as muddy water from entering the annular space K.
- the bearing device is used in a position close to the road surface and exposed to the external space. Therefore, when the vehicle travels in rainy weather, it directly receives muddy water on the road surface. For this reason, a sealing device used for a bearing device for a wheel requires a good sealing property.
- FIG. 6 illustrates the sealing device 80 installed in the opening portion on the flange 85 side of the annular space K, which is similar to the sealing device described in Patent Document 1.
- the sealing device 80 is fixed to the outer ring 81 and a rubber lip 83 which is in sliding contact with the inner shaft 82 and a cylindrical cover portion 84 (outer lip) are integrally formed.
- the cover portion 84 is fitted to the outer periphery of the outer ring 81 with a margin. Therefore, the applied muddy water is prevented from flowing along the outer periphery of the outer ring 81 and into the clearance S with respect to the flange 85 . As a result, the wear of the lip 83 can be prevented.
- the bearing device for a wheel is manufactured in a mass production facility. Therefore, the coating work is performed by spraying coarting directly onto the bearing device that has been assembled using a robot or the like.
- the coating adheres to the rubber member such as the lip 83 , the elasticity of the rubber is lowered by the solidified coating, and thus the sealing property may be reduced.
- the rubber material may be deteriorated by contact with the coating.
- the coating stays in the clearance S, the outer ring 81 and the inner shaft 82 are fixed by the solidified coating, and causes a problem that the running torque of the inner shaft 82 becomes heavy. For this reason, when coating, it is necessary to perform masking to prevent the coating from adhering to a rubber member such as the lip 83 .
- the sealing device 80 installed on the flange 85 side is incorporated in a portion interposed between the flange 85 and the leg portion 86 of the outer ring 81 in the axial direction, it cannot be easily masked.
- the masking device has a complicated structure, which increases the manufacturing cost of the bearing device.
- An object of the aspect of the invention is to provide a bearing device for a wheel which eliminates the need for masking a sealing device or makes it possible to mask the sealing device in an extremely simple manner when coating an outer peripheral surface of the bearing device for a wheel, especially an outer peripheral surface of a region interposed between a leg portion of an outer ring and a flange in an axial direction, in such a manner that an increase in manufacturing cost is prevented.
- a bearing device for a wheel which includes an outer ring including an outer raceway surface formed on an inner periphery and a leg portion protruding radially on an outer periphery and fixed to a vehicle body, an inner shaft including an inner raceway surface formed on an outer periphery and a flange provided on a shaft end to which a wheel is attached, a plurality of rolling elements rotatably provided between the outer raceway surface and the inner raceway surface, a sealing device which seals an opening portion on the flange side of an annular space formed between the outer ring and the inner shaft, and a slinger fixed to the inner shaft and extending axially at an radial outer side of the sealing device, in which the sealing device includes an elastic lip fixed to the outer ring and in sliding contact with the inner shaft and a cylindrical cover portion in elastic contact with an outer peripheral surface of the outer ring and the slinger is opposed to at least a part of an outer periphery of the cover portion
- the aspect of the invention when coating the outer peripheral surface of the bearing device for a wheel, particularly the outer peripheral surface of the region interposed in the axial direction between the fixed portion and the flange, an operation such as masking the sealing device is not necessary or masking can be performed in an extremely simple manner. Therefore, an increase in the manufacturing cost of the bearing device for a wheel can be prevented.
- FIG. 1 is an axial sectional view of a bearing device for a wheel according to a first embodiment of the invention.
- FIG. 2 is an enlarged view of a main part of a portion indicated by A in FIG. 1 .
- FIG. 3 is a schematic view illustrating a state in which coating is sprayed onto an outer peripheral surface of an outer ring.
- FIG. 4 is an enlarged view of a main part similar to FIG. 2 in a bearing device for a wheel according to a second embodiment.
- FIG. 5 is an enlarged view of a main part similar to FIG. 2 in a bearing device for a wheel according to a third embodiment.
- FIG. 6 is an axial sectional view of a related art sealing device installed on a flange side.
- FIG. 1 is an axial sectional view of a bearing device for a wheel 10 (hereinafter simply referred to as “bearing device”) according to a first embodiment (hereinafter referred to as “first embodiment”) of the invention when it is assembled to a knuckle 90 which is a suspension device of a vehicle.
- first embodiment a first embodiment of the invention when it is assembled to a knuckle 90 which is a suspension device of a vehicle.
- a sealing device is illustrated in a simplified manner.
- a direction of a rotation axis m of the bearing device 10 is referred to as an axial direction
- a direction orthogonal to the rotation axis m is referred to as a radial direction
- a direction of circling around the rotation axis m is referred to as a circumferential direction.
- the right side of the drawing is the outside of the vehicle and the left side is the inside of the vehicle. Therefore, in the following description, the right side of the drawing is referred to as “outer side” and the left side is referred to as “inner side”.
- the bearing device 10 includes an outer ring 11 , an inner shaft 12 , a plurality of balls 13 as rolling elements, a retainer 14 , a first sealing device 15 , and a second sealing device 30 .
- the outer ring 11 is manufactured by hot forged carbon steel and an outer ring main body 11 a of a substantially cylindrical shape and a plurality of leg portions 16 are integrally formed.
- a double row outer raceway surface 17 is formed on the inner periphery of the outer ring 11 .
- a sealing device mounting surface 18 is formed on the inner side of the outer raceway surface 17 and a sealing device mounting surface 19 is formed on the outer side of the outer raceway surface 17 .
- the leg portion 16 is formed in a direction protruding in the radial direction from the outer periphery of the outer ring main body 11 a .
- a turning process is performed on the inner side of each leg portion 16 and a mounting surface 20 orthogonal to the rotation axis m is formed.
- Each leg portion 16 is formed with a screw hole penetrating in the axial direction and the bearing device 10 is fixed to the knuckle 90 by screwing a bolt 21 into the screw hole.
- the inner shaft 12 includes a hub shaft 23 and an inner ring 24 .
- a screw shank 25 and a flange 26 are integrally formed by hot forged carbon steel.
- One inner raceway surface 27 is formed on the outer periphery of the screw shank 25 .
- the flange 26 has a disc shape and is formed on a shaft end portion on the outer side of the screw shank 25 in a direction orthogonal to the rotation axis m.
- a plurality of hub bolts 22 are assembled to the flange 26 to protrude outward in the axial direction and a wheel (not illustrated) is attached from the right side of the drawing.
- the inner ring 24 is made of bearing steel and the other inner raceway surface 27 is formed on the outer periphery thereof.
- the inner ring 24 is fixed integrally with the hub shaft 23 by being fitted into the shaft end portion on the inner side of the screw shank 25 coaxially and then plastically deforming the shaft end portion.
- An annular member 44 (see FIG. 2 ) is attached to a corner portion where the screw shank 25 of the inner shaft 12 and the flange 26 are connected and a part of the annular member 44 forms a slinger 40 .
- the details of the slinger 40 will be described below together with the form of the second sealing device 30 .
- the balls 13 are rotatably incorporated between the outer raceway surfaces 17 and the inner raceway surfaces 27 and are held by the retainers 14 at substantially equal intervals in the circumferential direction.
- the inner shaft 12 is rotatably supported with respect to the outer ring 11 .
- Grease is enclosed in an annular space K formed between the inner periphery of the outer ring 11 and the outer periphery of the screw shank 25 and the contact portions between the balls 13 and the raceway surfaces 17 and 27 are lubricated.
- the annular space K is open on both sides in the axial direction and the first sealing device 15 is incorporated in the opening portion on the inner side, and the second sealing device 30 is incorporated in the opening portion on the outer side.
- foreign matter such as muddy water and dust is prevented from entering the annular space K.
- FIG. 2 is an enlarged view of a main part of a portion indicated by A in FIG. 1 .
- the second sealing device 30 includes a core metal 31 , a plurality of lips 32 , and a cover portion 33 .
- the core metal 31 is formed by pressing a carbon steel plate or the like.
- Each lip 32 and the cover portion 33 are integrally formed by vulcanizing and molding an elastic body such as acrylic rubber in a die and are fixed to the core metal 31 by vulcanization adhesion.
- the core metal 31 includes a base portion 34 of an annular shape, a lip holding portion 35 extending radially inward from one axial end thereof, and an annular portion 36 extending radially outward from the other axial end of the base portion 34 .
- the second sealing device 30 is fixed to the outer ring 11 by press-fitting the outer periphery of the base portion 34 to the sealing device mounting surface 19 .
- the annular portion 36 abuts on the end surface of the outer ring 11 in the axial direction.
- Each lip 32 is supported by the lip holding portion 35 on the inner peripheral side of the base portion 34 .
- Each lip 32 is in sliding contact with the annular member 44 assembled to the inner shaft 12 , thereby preventing foreign matter from entering the annular space K.
- the cover portion 33 has a cylindrical shape and extends in the axial direction from the outer periphery of the annular portion 36 along the outer periphery of the outer ring 11 .
- a convex portion 37 is provided on the inner periphery of the cover portion 33 to protrude radially inward over the entire periphery.
- the inner diameter dimension of the convex portion 37 is smaller than the outer diameter dimension of the outer ring 11 and the cover portion 33 is in elastic contact with the outer peripheral surface of the outer ring 11 .
- the annular member 44 includes a seal sliding contact portion 45 where the lip 32 slides and the slinger 40 masking the second sealing device 30 .
- the annular member 44 is manufactured by pressing a thin stainless steel plate and the seal sliding contact portion 45 and the slinger 40 are integrally formed.
- the annular member 44 is incorporated along the outline shape of the inner shaft 12 and the axial cross section of the seal sliding contact portion 45 has an arc shape.
- An end portion on the inner peripheral side of the seal sliding contact portion 45 extends in the axial direction and has a cylindrical shape.
- An inner diameter dimension D is smaller than the outer diameter dimension of the inner shaft 12 and the annular member 44 is assembled on the outer periphery of the inner shaft 12 in an interference fit state.
- An end portion on the outer peripheral side of the seal sliding contact portion 45 extends outward in the radial direction and a flat plate portion 46 is formed in a direction orthogonal to the rotation axis m.
- the flat plate portion 46 abuts on the flange 26 in the axial direction.
- a clearance s 1 in the axial direction is provided between the flat plate portion 46 and the second sealing device 30 and the outer ring 11 and the inner shaft 12 are not in contact with each other.
- the slinger 40 is formed by bending the outer peripheral end of the flat plate portion 46 at right angles to the axial direction.
- the slinger 40 has a cylindrical shape and extends in the axial direction from the flange 26 toward the second sealing device 30 .
- the inner diameter dimension of the slinger 40 is slightly larger than the outer diameter dimension of the cover portion 33 .
- the slinger 40 faces the cover portion 33 with a clearance s 2 in the radial direction.
- the inner side end portion of the slinger 40 extends further to the inner side than the inner side end portion of the cover portion 33 . Thereby, the slinger 40 is opposed to the overall length in the axial direction of the cover portion 33 in the radial direction via the clearance s 2 .
- the slinger 40 is particularly effective when a portion (a range indicated by a two-dot chain line E in FIG. 1 ) interposed in the axial direction between the flange 26 and the leg portion 16 (fixed portion of the outer ring 11 ) of the outer ring 11 is coated
- FIG. 3 is a schematic view illustrating a state in which coating is sprayed onto the outer peripheral surface of the outer ring 11 by a coating device 42 .
- the coating is sprayed in a direction substantially perpendicular to the outer peripheral surface of the outer ring 11 .
- a case where the outer peripheral surface of the outer ring 11 is coated is described as an example. However, the same applies to a case where the other outer peripheral surface of the bearing device 10 is coated.
- the slinger 40 fixed to the inner shaft 12 extends in the axial direction outside the second sealing device 30 in the radial direction. Therefore, the axial clearance s 1 between the second sealing device 30 and the flange 26 is covered by the slinger 40 when viewed from the outside in the radial direction, so the coating sprayed toward the outer peripheral surface of the outer ring 11 does not enter the clearance s 1 .
- the coating sprayed toward the outer peripheral surface of the outer ring 11 easily enters the clearance s 1 . For this reason, the coating adheres to the lip 32 and then solidifies. In such a state where the solidified coating is adhered, the elasticity of the lip 32 is lowered, so the sealing property is reduced. There is a possibility that the rubber material forming the lip 32 may deteriorate due to contact with the coating. Since the clearance s 1 is extremely small, the coating may stay in the clearance s 1 and then solidify. In this case, there is a possibility that smooth rotation of the inner shaft 12 may be hindered by the inner shaft 12 and the outer ring 11 being fixed or the running torque of the inner shaft 12 becoming heavy.
- the coating since the coating does not enter from the clearance s 1 , the sealing property of the lip 32 can be favorably maintained. Since the coating does not stay between the outer ring 11 and the flange 26 , smooth rotation of the inner shaft 12 can be maintained.
- the cover portion 33 is covered by the slinger 40 over the entire axial direction, so that it is possible to prevent the coating from being directly sprayed onto the cover portion 33 . Since the coating does not adhere to the cover portion 33 , the elasticity of the cover portion 33 can be maintained and the rubber material forming the cover portion 33 is not deteriorated.
- the inner side end portion of the slinger 40 extends further to the inner side than the inner side end portion of the cover portion 33 . Thereby, even when the spraying direction of the coating is inclined, it is possible to prevent the coating from being sprayed to the cover portion 33 .
- the coating since the coating is not sprayed on the cover portion 33 , the coating does not stay in the clearance s 2 in the radial direction between the slinger 40 and the cover portion 33 . Therefore, since the inner shaft 12 and the outer ring 11 can be prevented from sticking to each other, smooth rotation of the inner shaft 12 can be maintained in the first embodiment.
- a protrusion amount L that the inner side end portion of the slinger 40 protrudes further to the inner side than the inner side end portion of the cover portion 33 should be approximately equal to a plate thickness tin the radial direction of the cover portion 33 .
- the protrusion amount L is small, if the spraying direction of the coating is inclined, the coating is sprayed on the end surface of the cover portion 33 . Therefore, the coating stays between the slinger 40 and the cover portion 33 and there is a risk of abnormality in the running torque of the inner shaft 12 .
- the protrusion amount L is extremely large, the weight of the bearing device 10 increases and the manufacturing cost increases, which is not preferable.
- the bearing device 10 of the first embodiment it is not necessary to remove or attach the slinger 40 every time it is coated, so that it is possible to directly coat the bearing device 10 that has been assembled. In this way, since an operation such as masking can be eliminated when coating the outer peripheral surface, an increase in the manufacturing cost of the bearing device for a wheel can be prevented.
- the bearing device manufactured in this way has the sealing portion provided with the cover portion 33 and the entire outer peripheral surface is coated, so durability is extremely high even when used in severe wet conditions.
- bearing device 50 a bearing device for a wheel 50 (hereinafter simply referred to as “bearing device 50 ”) according to a second embodiment, the form of the cover portion 54 of the second sealing device 51 and the form of the slinger 52 are different as compared with the bearing device 10 of the first embodiment. Description of the common configuration is omitted.
- FIG. 4 is an enlarged view of a main part similar to FIG. 2 in the bearing device 50 according to the second embodiment.
- the slinger 52 forms a part of the annular member 53 formed by pressing a thin stainless steel plate.
- the slinger 52 is formed in a cylindrical shape by bending the outer peripheral end of the flat plate portion 55 of the annular member 53 at a right angle in the axial direction.
- the outer periphery of the cover portion 54 in the second embodiment is formed of two cylindrical surfaces having different diameter dimensions and a cylindrical surface 56 having a large diameter and a cylindrical surface 57 having a small diameter are connected by a side surface 58 in a direction orthogonal to the rotation axis m.
- the cylindrical surface 57 having a small diameter is formed further on the outer side than the cylindrical surface 56 having a large diameter.
- the slinger 52 extends in the axial direction from the flange 26 toward the second sealing device 51 on the radially outer side of the cylindrical surface 57 having a small diameter.
- the outer diameter dimension of the cylindrical surface 57 having a small diameter is slightly smaller than the inner diameter dimension of the slinger 52 .
- the outer diameter dimension of the cylindrical surface 56 having a large diameter is substantially the same as the outer diameter dimension of the slinger 52 and the outer peripheral surface of the slinger 52 forms one cylindrical surface together with the cylindrical surface 56 having a large diameter.
- the slinger 52 is fixed to the inner shaft 12 and is opposed to a part in the axial direction of the cover portion 54 in the radial direction via the clearance s 2 .
- the inner side end portion of the slinger 52 has a slight clearance s 3 in the axial direction with respect to the side surface 58 , and thus the slinger 52 and the cover portion 54 are not in contact with each other. Thereby, the inner shaft 12 can rotate smoothly.
- a masking member 59 such as a tape is pasted across the cylindrical surface 56 of a large diameter and the outer peripheral surface of the slinger 52 .
- a state where the masking member 59 is attached is indicated by a two-dot chain line.
- the outer diameter dimension of the cylindrical surface 56 having a large diameter and the outer diameter dimension of the slinger 52 are substantially the same. Therefore, when the masking member 59 such as a tape is pasted, it can be easily pasted in the same manner as when pasting it on a simple cylindrical surface. In this way, the axial clearance s 3 between the cylindrical surface 56 having a large diameter and the slinger 52 can be reliably sealed on the outer peripheral side.
- the axial clearance s 1 between the second sealing device 51 and the flange 26 is covered by the slinger 52 when viewed from the outside in the radial direction. Therefore, the coating sprayed toward the outer peripheral surface of the outer ring 11 does not enter the clearance s 1 . Thus, the sealing property of the lip 32 can be maintained favorably after coating.
- the axial clearance s 3 between the cylindrical surface 56 having the large diameter and the slinger 52 is securely sealed. Therefore, since the coating does not stay in the clearance s 3 , the cover portion 54 and the slinger 52 are not fixed by the solidified coating.
- the clearances s 2 and s 3 are maintained in the radial direction and the axial direction between the slinger 52 and the cover portion 54 after coating, smooth rotation of the inner shaft 12 can be maintained.
- the masking member 59 is removed.
- the slinger 52 is exposed to the external space.
- the slinger 52 is made of a stainless steel plate and does not rust.
- the entire surface of the cylindrical surface 56 of the large diameter is covered with the masking member 59 , it is possible to prevent the coating from adhering to the cover portion 54 . Thereby, while maintaining the elasticity of the cover portion 54 , the deterioration of the rubber material forming the cover portion 54 can be prevented.
- the masking member 59 for preventing the coating from splashing on the lip 32 of the sealing device can be attached and removed extremely easily. Therefore, it can coat directly by masking the bearing device 50 which completed the assembly by a simple method. Therefore, when coating the outer peripheral surface, operations such as masking can be simplified, and thus an increase in the manufacturing cost of the bearing device for a wheel can be prevented.
- bearing device 70 for a wheel 70
- the form of the slinger 72 is different as compared with the bearing device 10 of the first embodiment. Description of the common configuration is omitted.
- FIG. 5 is an enlarged view of a main part similar to FIG. 2 in the bearing device 70 .
- the axial cross-section shape of the slinger 72 is formed into an L shape by pressing a thin stainless steel plate.
- a recess portion 74 of an annular shape which is coaxial with the rotation axis m is formed on the inner side lateral surface of the flange 26 .
- the slinger 72 is fixed to the flange 26 by swaging or the like after being fitted into the recess portion 74 .
- the slinger 72 has a cylindrical shape and extends in the axial direction from the flange 26 toward the second sealing device 71 .
- the inner diameter dimension of the slinger 72 is slightly larger than the outer diameter dimension of the cover portion 33 .
- the inner side end portion of the slinger 72 extends further to the inner side than the inner side end portion of the cover portion 33 .
- the slinger 72 is opposed to the entire axial length of the cover portion 33 in the radial direction via the clearance s 2 .
- the operational effect of the slinger 72 in the bearing device 70 is the same as that of the slinger 40 of the first embodiment. That is, when the bearing device 70 is coated, the coating is prevented from adhering to the lip 32 and the cover portion 33 . Therefore, the favorable sealing property is maintained and the deterioration of the rubber member is prevented. The coating is prevented from staying at the clearances s 1 and s 2 , and thus the inner shaft 12 can rotate smoothly. Detailed description is omitted.
- the bearing device 70 As in the bearing device 10 of the first embodiment, it is not necessary to remove the slinger 72 every time it is coated, so that it is possible to directly coat the bearing device 70 that has been assembled. In this way, since an operation such as masking can be eliminated when coating the outer peripheral surface, an increase in the manufacturing cost of the bearing device for a wheel can be prevented.
- the aspect of the invention when coating the outer peripheral surface of the bearing device, particularly the outer peripheral surface of the region interposed in the axial direction between the fixed portion and the flange, an operation such as masking is not necessary or masking can be performed in an extremely simple manner. Therefore, an increase in the manufacturing cost of the bearing device for a wheel can be prevented.
- the invention is not limited to the embodiments described above and various other modifications are possible.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Sealing Of Bearings (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
A bearing device for a wheel includes: an outer ring including a leg portion protruding radially on an outer periphery; an inner shaft provided on a shaft end; rolling elements; a sealing device which seals an opening portion on the flange side; and a slinger fixed to the inner shaft and extending axially at a radial outer side of the sealing device. The sealing device includes an elastic lip and a cylindrical cover portion in elastic contact with an outer peripheral surface of the outer ring. The slinger is opposed to at least a part of an outer periphery of the cover portion in a radial direction via a clearance.
Description
- Aspects of the present invention relate to a bearing device for a wheel, and more particularly to improvement of a sealing device.
- In order to rotationally support a wheel of a vehicle, a unit-type bearing device in which a rolling bearing, a wheel mounting flange, and the like are integrated is used. For example, as illustrated in
FIG. 6 , a bearing device of Patent Document 1 includes anouter ring 81 fixed to a suspension device such as a knuckle and aninner shaft 82 which is rotatable inside theouter ring 81. Aleg portion 86 for fixing the bearing device to the knuckle is provided on the outer periphery of theouter ring 81 and aflange 85 for fixing the wheel is provided at the shaft end of theinner shaft 82. - A plurality of
balls 87 are incorporated between theouter ring 81 and theinner shaft 82. Grease is sealed in an annular space K formed between the inner periphery of theouter ring 81 and the outer periphery of theinner shaft 82 and the raceway surface on which theball 87 rolls is lubricated. Sealing devices are respectively incorporated in opening portions on both sides in an axial direction of the annular space K to prevent foreign matters such as muddy water from entering the annular space K. - The bearing device is used in a position close to the road surface and exposed to the external space. Therefore, when the vehicle travels in rainy weather, it directly receives muddy water on the road surface. For this reason, a sealing device used for a bearing device for a wheel requires a good sealing property.
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FIG. 6 illustrates thesealing device 80 installed in the opening portion on theflange 85 side of the annular space K, which is similar to the sealing device described in Patent Document 1. Thesealing device 80 is fixed to theouter ring 81 and arubber lip 83 which is in sliding contact with theinner shaft 82 and a cylindrical cover portion 84 (outer lip) are integrally formed. Thecover portion 84 is fitted to the outer periphery of theouter ring 81 with a margin. Therefore, the applied muddy water is prevented from flowing along the outer periphery of theouter ring 81 and into the clearance S with respect to theflange 85. As a result, the wear of thelip 83 can be prevented. - Thus, in the bearing device for a wheel, various measures are taken to prevent the intrusion of muddy water. However, as described above, since the bearing device is used in a state exposed to the external space, rust may be generated on the outer peripheral surface by the applied muddy water. In particular, when calcium chloride is sprayed to prevent freezing of the road surface, rusting occurs further.
- When rust is generated on the outer peripheral surface of the bearing device in this way, the rust may enter the sliding contact portion of the
lip 83 and the sealing property may be reduced. The appearance of the vehicle is significantly deteriorated due to rusting. For this reason, in the bearing device for a wheel, there is a growing need to coat the entire exposed portion to prevent the occurrence of rust. -
- Patent Document 1: JP-A-2015-64044
- The bearing device for a wheel is manufactured in a mass production facility. Therefore, the coating work is performed by spraying coarting directly onto the bearing device that has been assembled using a robot or the like. In this case, when the coating adheres to the rubber member such as the
lip 83, the elasticity of the rubber is lowered by the solidified coating, and thus the sealing property may be reduced. The rubber material may be deteriorated by contact with the coating. When the coating stays in the clearance S, theouter ring 81 and theinner shaft 82 are fixed by the solidified coating, and causes a problem that the running torque of theinner shaft 82 becomes heavy. For this reason, when coating, it is necessary to perform masking to prevent the coating from adhering to a rubber member such as thelip 83. - However, in particular, since the
sealing device 80 installed on theflange 85 side is incorporated in a portion interposed between theflange 85 and theleg portion 86 of theouter ring 81 in the axial direction, it cannot be easily masked. In an automated mass production facility, the masking device has a complicated structure, which increases the manufacturing cost of the bearing device. - An object of the aspect of the invention is to provide a bearing device for a wheel which eliminates the need for masking a sealing device or makes it possible to mask the sealing device in an extremely simple manner when coating an outer peripheral surface of the bearing device for a wheel, especially an outer peripheral surface of a region interposed between a leg portion of an outer ring and a flange in an axial direction, in such a manner that an increase in manufacturing cost is prevented.
- According to an aspect of the invention, there is provided a bearing device for a wheel which includes an outer ring including an outer raceway surface formed on an inner periphery and a leg portion protruding radially on an outer periphery and fixed to a vehicle body, an inner shaft including an inner raceway surface formed on an outer periphery and a flange provided on a shaft end to which a wheel is attached, a plurality of rolling elements rotatably provided between the outer raceway surface and the inner raceway surface, a sealing device which seals an opening portion on the flange side of an annular space formed between the outer ring and the inner shaft, and a slinger fixed to the inner shaft and extending axially at an radial outer side of the sealing device, in which the sealing device includes an elastic lip fixed to the outer ring and in sliding contact with the inner shaft and a cylindrical cover portion in elastic contact with an outer peripheral surface of the outer ring and the slinger is opposed to at least a part of an outer periphery of the cover portion in a radial direction via a clearance.
- According to the aspect of the invention, when coating the outer peripheral surface of the bearing device for a wheel, particularly the outer peripheral surface of the region interposed in the axial direction between the fixed portion and the flange, an operation such as masking the sealing device is not necessary or masking can be performed in an extremely simple manner. Therefore, an increase in the manufacturing cost of the bearing device for a wheel can be prevented.
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FIG. 1 is an axial sectional view of a bearing device for a wheel according to a first embodiment of the invention. -
FIG. 2 is an enlarged view of a main part of a portion indicated by A inFIG. 1 . -
FIG. 3 is a schematic view illustrating a state in which coating is sprayed onto an outer peripheral surface of an outer ring. -
FIG. 4 is an enlarged view of a main part similar toFIG. 2 in a bearing device for a wheel according to a second embodiment. -
FIG. 5 is an enlarged view of a main part similar toFIG. 2 in a bearing device for a wheel according to a third embodiment. -
FIG. 6 is an axial sectional view of a related art sealing device installed on a flange side. - Embodiments of the invention will be described with reference to the drawings.
FIG. 1 is an axial sectional view of a bearing device for a wheel 10 (hereinafter simply referred to as “bearing device”) according to a first embodiment (hereinafter referred to as “first embodiment”) of the invention when it is assembled to aknuckle 90 which is a suspension device of a vehicle. InFIG. 1 , a sealing device is illustrated in a simplified manner. In the following description, a direction of a rotation axis m of thebearing device 10 is referred to as an axial direction, a direction orthogonal to the rotation axis m is referred to as a radial direction, and a direction of circling around the rotation axis m is referred to as a circumferential direction. InFIG. 1 , the right side of the drawing is the outside of the vehicle and the left side is the inside of the vehicle. Therefore, in the following description, the right side of the drawing is referred to as “outer side” and the left side is referred to as “inner side”. - The
bearing device 10 includes anouter ring 11, aninner shaft 12, a plurality ofballs 13 as rolling elements, aretainer 14, afirst sealing device 15, and asecond sealing device 30. - The
outer ring 11 is manufactured by hot forged carbon steel and an outer ringmain body 11 a of a substantially cylindrical shape and a plurality ofleg portions 16 are integrally formed. - A double row
outer raceway surface 17 is formed on the inner periphery of theouter ring 11. A sealingdevice mounting surface 18 is formed on the inner side of theouter raceway surface 17 and a sealingdevice mounting surface 19 is formed on the outer side of theouter raceway surface 17. - The
leg portion 16 is formed in a direction protruding in the radial direction from the outer periphery of the outer ringmain body 11 a. A turning process is performed on the inner side of eachleg portion 16 and amounting surface 20 orthogonal to the rotation axis m is formed. Eachleg portion 16 is formed with a screw hole penetrating in the axial direction and thebearing device 10 is fixed to theknuckle 90 by screwing abolt 21 into the screw hole. - The
inner shaft 12 includes ahub shaft 23 and aninner ring 24. - In the
hub shaft 23, ascrew shank 25 and aflange 26 are integrally formed by hot forged carbon steel. Oneinner raceway surface 27 is formed on the outer periphery of thescrew shank 25. Theflange 26 has a disc shape and is formed on a shaft end portion on the outer side of thescrew shank 25 in a direction orthogonal to the rotation axis m. A plurality ofhub bolts 22 are assembled to theflange 26 to protrude outward in the axial direction and a wheel (not illustrated) is attached from the right side of the drawing. - The
inner ring 24 is made of bearing steel and the otherinner raceway surface 27 is formed on the outer periphery thereof. Theinner ring 24 is fixed integrally with thehub shaft 23 by being fitted into the shaft end portion on the inner side of thescrew shank 25 coaxially and then plastically deforming the shaft end portion. - An annular member 44 (see
FIG. 2 ) is attached to a corner portion where thescrew shank 25 of theinner shaft 12 and theflange 26 are connected and a part of theannular member 44 forms aslinger 40. The details of theslinger 40 will be described below together with the form of thesecond sealing device 30. - The
balls 13 are rotatably incorporated between the outer raceway surfaces 17 and the inner raceway surfaces 27 and are held by theretainers 14 at substantially equal intervals in the circumferential direction. Thus, theinner shaft 12 is rotatably supported with respect to theouter ring 11. Grease is enclosed in an annular space K formed between the inner periphery of theouter ring 11 and the outer periphery of thescrew shank 25 and the contact portions between theballs 13 and the raceway surfaces 17 and 27 are lubricated. - The annular space K is open on both sides in the axial direction and the
first sealing device 15 is incorporated in the opening portion on the inner side, and thesecond sealing device 30 is incorporated in the opening portion on the outer side. Thus, foreign matter such as muddy water and dust is prevented from entering the annular space K. - Next, the assembled state of the
second sealing device 30 will be described. The first embodiment is characterized by the form of thesecond sealing device 30 and theslinger 40 installed radially outward.FIG. 2 is an enlarged view of a main part of a portion indicated by A inFIG. 1 . - As illustrated in
FIG. 2 , thesecond sealing device 30 includes acore metal 31, a plurality oflips 32, and acover portion 33. - The
core metal 31 is formed by pressing a carbon steel plate or the like. Eachlip 32 and thecover portion 33 are integrally formed by vulcanizing and molding an elastic body such as acrylic rubber in a die and are fixed to thecore metal 31 by vulcanization adhesion. - The
core metal 31 includes abase portion 34 of an annular shape, alip holding portion 35 extending radially inward from one axial end thereof, and anannular portion 36 extending radially outward from the other axial end of thebase portion 34. Thesecond sealing device 30 is fixed to theouter ring 11 by press-fitting the outer periphery of thebase portion 34 to the sealingdevice mounting surface 19. Theannular portion 36 abuts on the end surface of theouter ring 11 in the axial direction. - Each
lip 32 is supported by thelip holding portion 35 on the inner peripheral side of thebase portion 34. Eachlip 32 is in sliding contact with theannular member 44 assembled to theinner shaft 12, thereby preventing foreign matter from entering the annular space K. Thecover portion 33 has a cylindrical shape and extends in the axial direction from the outer periphery of theannular portion 36 along the outer periphery of theouter ring 11. Aconvex portion 37 is provided on the inner periphery of thecover portion 33 to protrude radially inward over the entire periphery. The inner diameter dimension of theconvex portion 37 is smaller than the outer diameter dimension of theouter ring 11 and thecover portion 33 is in elastic contact with the outer peripheral surface of theouter ring 11. - The
annular member 44 includes a seal slidingcontact portion 45 where thelip 32 slides and theslinger 40 masking thesecond sealing device 30. Theannular member 44 is manufactured by pressing a thin stainless steel plate and the seal slidingcontact portion 45 and theslinger 40 are integrally formed. - The
annular member 44 is incorporated along the outline shape of theinner shaft 12 and the axial cross section of the seal slidingcontact portion 45 has an arc shape. An end portion on the inner peripheral side of the seal slidingcontact portion 45 extends in the axial direction and has a cylindrical shape. An inner diameter dimension D is smaller than the outer diameter dimension of theinner shaft 12 and theannular member 44 is assembled on the outer periphery of theinner shaft 12 in an interference fit state. An end portion on the outer peripheral side of the seal slidingcontact portion 45 extends outward in the radial direction and aflat plate portion 46 is formed in a direction orthogonal to the rotation axis m. Theflat plate portion 46 abuts on theflange 26 in the axial direction. A clearance s1 in the axial direction is provided between theflat plate portion 46 and thesecond sealing device 30 and theouter ring 11 and theinner shaft 12 are not in contact with each other. - The
slinger 40 is formed by bending the outer peripheral end of theflat plate portion 46 at right angles to the axial direction. Theslinger 40 has a cylindrical shape and extends in the axial direction from theflange 26 toward thesecond sealing device 30. The inner diameter dimension of theslinger 40 is slightly larger than the outer diameter dimension of thecover portion 33. Theslinger 40 faces thecover portion 33 with a clearance s2 in the radial direction. - In the first embodiment, the inner side end portion of the
slinger 40 extends further to the inner side than the inner side end portion of thecover portion 33. Thereby, theslinger 40 is opposed to the overall length in the axial direction of thecover portion 33 in the radial direction via the clearance s2. - Next, the operational effect of the
slinger 40 in thebearing device 10 of the first embodiment will be described. Theslinger 40 is particularly effective when a portion (a range indicated by a two-dot chain line E inFIG. 1 ) interposed in the axial direction between theflange 26 and the leg portion 16 (fixed portion of the outer ring 11) of theouter ring 11 is coated - Coating is performed by spraying coating with compressed air.
FIG. 3 is a schematic view illustrating a state in which coating is sprayed onto the outer peripheral surface of theouter ring 11 by acoating device 42. The coating is sprayed in a direction substantially perpendicular to the outer peripheral surface of theouter ring 11. Here, a case where the outer peripheral surface of theouter ring 11 is coated is described as an example. However, the same applies to a case where the other outer peripheral surface of the bearingdevice 10 is coated. - As illustrated in
FIG. 3 , in the first embodiment, theslinger 40 fixed to theinner shaft 12 extends in the axial direction outside thesecond sealing device 30 in the radial direction. Therefore, the axial clearance s1 between thesecond sealing device 30 and theflange 26 is covered by theslinger 40 when viewed from the outside in the radial direction, so the coating sprayed toward the outer peripheral surface of theouter ring 11 does not enter the clearance s1. - When it is assumed that the
slinger 40 is not provided, the coating sprayed toward the outer peripheral surface of theouter ring 11 easily enters the clearance s1. For this reason, the coating adheres to thelip 32 and then solidifies. In such a state where the solidified coating is adhered, the elasticity of thelip 32 is lowered, so the sealing property is reduced. There is a possibility that the rubber material forming thelip 32 may deteriorate due to contact with the coating. Since the clearance s1 is extremely small, the coating may stay in the clearance s1 and then solidify. In this case, there is a possibility that smooth rotation of theinner shaft 12 may be hindered by theinner shaft 12 and theouter ring 11 being fixed or the running torque of theinner shaft 12 becoming heavy. - On the other hand, in the first embodiment, since the coating does not enter from the clearance s1, the sealing property of the
lip 32 can be favorably maintained. Since the coating does not stay between theouter ring 11 and theflange 26, smooth rotation of theinner shaft 12 can be maintained. - In the first embodiment, the
cover portion 33 is covered by theslinger 40 over the entire axial direction, so that it is possible to prevent the coating from being directly sprayed onto thecover portion 33. Since the coating does not adhere to thecover portion 33, the elasticity of thecover portion 33 can be maintained and the rubber material forming thecover portion 33 is not deteriorated. - The inner side end portion of the
slinger 40 extends further to the inner side than the inner side end portion of thecover portion 33. Thereby, even when the spraying direction of the coating is inclined, it is possible to prevent the coating from being sprayed to thecover portion 33. - Thus, since the coating is not sprayed on the
cover portion 33, the coating does not stay in the clearance s2 in the radial direction between theslinger 40 and thecover portion 33. Therefore, since theinner shaft 12 and theouter ring 11 can be prevented from sticking to each other, smooth rotation of theinner shaft 12 can be maintained in the first embodiment. - A protrusion amount L that the inner side end portion of the
slinger 40 protrudes further to the inner side than the inner side end portion of thecover portion 33 should be approximately equal to a plate thickness tin the radial direction of thecover portion 33. When the protrusion amount L is small, if the spraying direction of the coating is inclined, the coating is sprayed on the end surface of thecover portion 33. Therefore, the coating stays between theslinger 40 and thecover portion 33 and there is a risk of abnormality in the running torque of theinner shaft 12. On the other hand, when the protrusion amount L is extremely large, the weight of the bearingdevice 10 increases and the manufacturing cost increases, which is not preferable. - As described above, in the
bearing device 10 of the first embodiment, it is not necessary to remove or attach theslinger 40 every time it is coated, so that it is possible to directly coat the bearingdevice 10 that has been assembled. In this way, since an operation such as masking can be eliminated when coating the outer peripheral surface, an increase in the manufacturing cost of the bearing device for a wheel can be prevented. - The bearing device manufactured in this way has the sealing portion provided with the
cover portion 33 and the entire outer peripheral surface is coated, so durability is extremely high even when used in severe wet conditions. - Another embodiment (hereinafter, “second embodiment”) of the invention will be described. In a bearing device for a wheel 50 (hereinafter simply referred to as “bearing
device 50”) according to a second embodiment, the form of thecover portion 54 of thesecond sealing device 51 and the form of theslinger 52 are different as compared with the bearingdevice 10 of the first embodiment. Description of the common configuration is omitted. -
FIG. 4 is an enlarged view of a main part similar toFIG. 2 in thebearing device 50 according to the second embodiment. In the second embodiment, as in the first embodiment, theslinger 52 forms a part of theannular member 53 formed by pressing a thin stainless steel plate. Theslinger 52 is formed in a cylindrical shape by bending the outer peripheral end of theflat plate portion 55 of theannular member 53 at a right angle in the axial direction. - The outer periphery of the
cover portion 54 in the second embodiment is formed of two cylindrical surfaces having different diameter dimensions and acylindrical surface 56 having a large diameter and acylindrical surface 57 having a small diameter are connected by aside surface 58 in a direction orthogonal to the rotation axis m. Thecylindrical surface 57 having a small diameter is formed further on the outer side than thecylindrical surface 56 having a large diameter. - The
slinger 52 extends in the axial direction from theflange 26 toward thesecond sealing device 51 on the radially outer side of thecylindrical surface 57 having a small diameter. The outer diameter dimension of thecylindrical surface 57 having a small diameter is slightly smaller than the inner diameter dimension of theslinger 52. The outer diameter dimension of thecylindrical surface 56 having a large diameter is substantially the same as the outer diameter dimension of theslinger 52 and the outer peripheral surface of theslinger 52 forms one cylindrical surface together with thecylindrical surface 56 having a large diameter. Thus, theslinger 52 is fixed to theinner shaft 12 and is opposed to a part in the axial direction of thecover portion 54 in the radial direction via the clearance s2. - The inner side end portion of the
slinger 52 has a slight clearance s3 in the axial direction with respect to theside surface 58, and thus theslinger 52 and thecover portion 54 are not in contact with each other. Thereby, theinner shaft 12 can rotate smoothly. - Next, the operational effect of the
slinger 52 in thebearing device 50 will be described. - In the
bearing device 50, when coating the outer peripheral surface of theouter ring 11, a maskingmember 59 such as a tape is pasted across thecylindrical surface 56 of a large diameter and the outer peripheral surface of theslinger 52. InFIG. 4 , a state where the maskingmember 59 is attached is indicated by a two-dot chain line. - In the
bearing device 50, the outer diameter dimension of thecylindrical surface 56 having a large diameter and the outer diameter dimension of theslinger 52 are substantially the same. Therefore, when the maskingmember 59 such as a tape is pasted, it can be easily pasted in the same manner as when pasting it on a simple cylindrical surface. In this way, the axial clearance s3 between thecylindrical surface 56 having a large diameter and theslinger 52 can be reliably sealed on the outer peripheral side. - Thus, in the
bearing device 50, the axial clearance s1 between thesecond sealing device 51 and theflange 26 is covered by theslinger 52 when viewed from the outside in the radial direction. Therefore, the coating sprayed toward the outer peripheral surface of theouter ring 11 does not enter the clearance s1. Thus, the sealing property of thelip 32 can be maintained favorably after coating. - By sticking the masking
member 59, the axial clearance s3 between thecylindrical surface 56 having the large diameter and theslinger 52 is securely sealed. Therefore, since the coating does not stay in the clearance s3, thecover portion 54 and theslinger 52 are not fixed by the solidified coating. - Thus, since the clearances s2 and s3 are maintained in the radial direction and the axial direction between the
slinger 52 and thecover portion 54 after coating, smooth rotation of theinner shaft 12 can be maintained. When the coating operation is completed, the maskingmember 59 is removed. When the maskingmember 59 is removed, theslinger 52 is exposed to the external space. Theslinger 52 is made of a stainless steel plate and does not rust. - Since the entire surface of the
cylindrical surface 56 of the large diameter is covered with the maskingmember 59, it is possible to prevent the coating from adhering to thecover portion 54. Thereby, while maintaining the elasticity of thecover portion 54, the deterioration of the rubber material forming thecover portion 54 can be prevented. - As described above, in the
bearing device 50 of the second embodiment, the maskingmember 59 for preventing the coating from splashing on thelip 32 of the sealing device can be attached and removed extremely easily. Therefore, it can coat directly by masking the bearingdevice 50 which completed the assembly by a simple method. Therefore, when coating the outer peripheral surface, operations such as masking can be simplified, and thus an increase in the manufacturing cost of the bearing device for a wheel can be prevented. - Another embodiment (hereinafter, “third embodiment”) of the invention will be described. In a bearing device for a wheel 70 (hereinafter simply “bearing
device 70”) of a third embodiment, the form of theslinger 72 is different as compared with the bearingdevice 10 of the first embodiment. Description of the common configuration is omitted. -
FIG. 5 is an enlarged view of a main part similar toFIG. 2 in thebearing device 70. - In the
bearing device 70, the axial cross-section shape of theslinger 72 is formed into an L shape by pressing a thin stainless steel plate. Arecess portion 74 of an annular shape which is coaxial with the rotation axis m is formed on the inner side lateral surface of theflange 26. Theslinger 72 is fixed to theflange 26 by swaging or the like after being fitted into therecess portion 74. - The
slinger 72 has a cylindrical shape and extends in the axial direction from theflange 26 toward thesecond sealing device 71. The inner diameter dimension of theslinger 72 is slightly larger than the outer diameter dimension of thecover portion 33. In thebearing device 70, the inner side end portion of theslinger 72 extends further to the inner side than the inner side end portion of thecover portion 33. Thus, theslinger 72 is opposed to the entire axial length of thecover portion 33 in the radial direction via the clearance s2. - The operational effect of the
slinger 72 in thebearing device 70 is the same as that of theslinger 40 of the first embodiment. That is, when the bearingdevice 70 is coated, the coating is prevented from adhering to thelip 32 and thecover portion 33. Therefore, the favorable sealing property is maintained and the deterioration of the rubber member is prevented. The coating is prevented from staying at the clearances s1 and s2, and thus theinner shaft 12 can rotate smoothly. Detailed description is omitted. - In the
bearing device 70, as in thebearing device 10 of the first embodiment, it is not necessary to remove theslinger 72 every time it is coated, so that it is possible to directly coat the bearingdevice 70 that has been assembled. In this way, since an operation such as masking can be eliminated when coating the outer peripheral surface, an increase in the manufacturing cost of the bearing device for a wheel can be prevented. - As can be understood from the above description, according to the aspect of the invention, when coating the outer peripheral surface of the bearing device, particularly the outer peripheral surface of the region interposed in the axial direction between the fixed portion and the flange, an operation such as masking is not necessary or masking can be performed in an extremely simple manner. Therefore, an increase in the manufacturing cost of the bearing device for a wheel can be prevented. The invention is not limited to the embodiments described above and various other modifications are possible.
- This application is based on a Japanese patent application (Japanese Patent Application No. 2017-126025) filed on Jun. 28, 2017, the contents of which are incorporated herein by reference.
-
-
- (First Embodiment)
- 10: bearing device for wheel
- 11: outer ring
- 12: inner shaft
- 13: ball
- 14: retainer
- 15: first sealing device
- 16: leg portion
- 17: outer raceway surface
- 26: flange
- 27: inner raceway surface
- 30: second sealing device
- 31: core metal
- 32: lip
- 33: cover portion
- 40: slinger
- 44: annular member
- (Second Embodiment)
- 50: bearing device for wheel
- 51: second sealing device
- 52: slinger
- 53: annular member
- 54: cover portion
- 56: cylindrical surface of large diameter
- 57: cylindrical surface of small diameter
- 58: side surface,
- 59: masking member
- (Third Embodiment)
- 70: bearing device for wheel
- 71: second sealing device
- 72: slinger
- 74: recess portion
- (Related Art)
- 80: sealing device
- 81: outer ring
- 82: inner shaft
- 83: lip
- 84: cover portion
- 85: flange
- 90: knuckle
Claims (4)
1. A bearing device for a wheel, comprising:
an outer ring comprising: an outer raceway surface formed on an inner periphery; and a leg portion protruding radially on an outer periphery and fixed to a vehicle body;
an inner shaft comprising: an inner raceway surface formed on an outer periphery; and a flange provided on a shaft end to which a wheel is attached;
a plurality of rolling elements rotatably provided between the outer raceway surface and the inner raceway surface;
a sealing device which seals an opening portion on a flange side of an annular space formed between the outer ring and the inner shaft; and
a slinger fixed to the inner shaft and extending axially at a radial outer side of the sealing device,
wherein the sealing device comprises: an elastic lip fixed to the outer ring and in sliding contact with the inner shaft; and a cylindrical cover portion in elastic contact with an outer peripheral surface of the outer ring, and
wherein the slinger is opposed to at least a part of an outer periphery of the cover portion in a radial direction via a clearance.
2. The bearing device for a wheel according to claim 1 ,
wherein the slinger is opposed to an overall length in an axial direction of the cover portion in the radial direction via the clearance.
3. The bearing device for a wheel according to claim 1 ,
wherein the slinger is radially opposed to a part of an outer periphery of the cover portion via the clearance, and an outer diameter dimension of the other part of the outer periphery of the cover portion which is the a part not opposed to the slinger in the radial direction is substantially equal to an outer diameter dimension of the slinger.
4. The bearing device for a wheel according to claim 1 ,
wherein at least part of an outer peripheral surface of the outer ring in a portion between the leg portion of the outer ring and the flange of the inner shaft is coated.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017126025A JP2019007597A (en) | 2017-06-28 | 2017-06-28 | Bearing device for wheel |
JP2017-126025 | 2017-06-28 | ||
JPJP2017-126025 | 2017-06-28 | ||
PCT/JP2018/023391 WO2019004017A1 (en) | 2017-06-28 | 2018-06-20 | Bearing device for wheel |
Publications (2)
Publication Number | Publication Date |
---|---|
US20200224716A1 true US20200224716A1 (en) | 2020-07-16 |
US10948018B2 US10948018B2 (en) | 2021-03-16 |
Family
ID=64741495
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/627,233 Active US10948018B2 (en) | 2017-06-28 | 2018-06-20 | Bearing device for wheel |
Country Status (6)
Country | Link |
---|---|
US (1) | US10948018B2 (en) |
JP (1) | JP2019007597A (en) |
KR (1) | KR20200019896A (en) |
CN (1) | CN110799766A (en) |
DE (1) | DE112018003336T5 (en) |
WO (1) | WO2019004017A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11389029B2 (en) * | 2018-06-14 | 2022-07-19 | Jura Elektroapparate Ag | Grinding device for grinding coffee beans |
US20220381293A1 (en) * | 2021-05-31 | 2022-12-01 | Aktiebolaget Skf | Sealing device for a bearing unit |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007139197A1 (en) * | 2006-05-31 | 2007-12-06 | Nsk Ltd. | Rolling device |
JP4371429B2 (en) * | 2007-05-29 | 2009-11-25 | Ntn株式会社 | Wheel bearing device |
JP2012082912A (en) * | 2010-10-13 | 2012-04-26 | Jtekt Corp | Rolling bearing device for wheel |
KR101411615B1 (en) * | 2012-07-04 | 2014-06-25 | 주식회사 일진글로벌 | Sealing apparatus and wheel bearing assembly thereof |
JP6200252B2 (en) | 2013-09-25 | 2017-09-20 | 光洋シーリングテクノ株式会社 | Sealing device |
JP6384036B2 (en) * | 2013-10-23 | 2018-09-05 | 株式会社ジェイテクト | Wheel bearing device |
JP2015224746A (en) * | 2014-05-29 | 2015-12-14 | 株式会社ジェイテクト | Rolling bearing device for wheel |
JP2016080141A (en) * | 2014-10-22 | 2016-05-16 | 光洋シーリングテクノ株式会社 | Sealing device |
KR101681270B1 (en) * | 2015-01-30 | 2016-12-12 | 주식회사 일진글로벌 | Sealing structure of wheel bearing for vehicle |
ITUB20151194A1 (en) * | 2015-05-29 | 2016-11-29 | Skf Ab | ROLLING BEARING INCLUDING A LOW FRICTION SEALING DEVICE, ESPECIALLY FOR A WHEEL HUB ASSEMBLY. |
CN114635915B (en) * | 2015-06-12 | 2024-05-10 | Nok株式会社 | Sealing device |
JP2017036740A (en) * | 2015-08-06 | 2017-02-16 | 光洋シーリングテクノ株式会社 | Sealing device |
DE102015218625A1 (en) * | 2015-09-28 | 2017-03-30 | Aktiebolaget Skf | Seal for a wheel bearing assembly |
CN205136384U (en) * | 2015-11-25 | 2016-04-06 | 浙江固耐橡塑科技有限公司 | Low moment of torsion wheel hub bearing sealing device |
ITUA20162310A1 (en) * | 2016-04-05 | 2017-10-05 | Skf Ab | Low friction sealing device and rolling bearing equipped with the same. |
JP6686692B2 (en) * | 2016-05-18 | 2020-04-22 | 株式会社ジェイテクト | Wheel bearing device |
-
2017
- 2017-06-28 JP JP2017126025A patent/JP2019007597A/en not_active Withdrawn
-
2018
- 2018-06-20 WO PCT/JP2018/023391 patent/WO2019004017A1/en active Application Filing
- 2018-06-20 CN CN201880043546.1A patent/CN110799766A/en active Pending
- 2018-06-20 US US16/627,233 patent/US10948018B2/en active Active
- 2018-06-20 DE DE112018003336.8T patent/DE112018003336T5/en not_active Withdrawn
- 2018-06-20 KR KR1020197038122A patent/KR20200019896A/en unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11389029B2 (en) * | 2018-06-14 | 2022-07-19 | Jura Elektroapparate Ag | Grinding device for grinding coffee beans |
US20220381293A1 (en) * | 2021-05-31 | 2022-12-01 | Aktiebolaget Skf | Sealing device for a bearing unit |
US11953058B2 (en) * | 2021-05-31 | 2024-04-09 | Aktiebolaget Skf | Sealing device for a bearing unit |
Also Published As
Publication number | Publication date |
---|---|
KR20200019896A (en) | 2020-02-25 |
CN110799766A (en) | 2020-02-14 |
WO2019004017A1 (en) | 2019-01-03 |
DE112018003336T5 (en) | 2020-03-12 |
US10948018B2 (en) | 2021-03-16 |
JP2019007597A (en) | 2019-01-17 |
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